[X2Go-User] x2go performance again

[Stefan Seidel]

Hi,

some time ago I inquired about peoples experience with x2go in a LAN 
environment. I have now built a TCE live system (TFTP-only, no NFS) and a new 
Jessie server and I am still not very satisfied. I tried almost all available 
options. Here is the setup:

1GBit/s LAN on both sides
Host: AMD 4.4GHz 8-core CPU with 32GB RAM
Client: Pentium D 2.8GHz, 1GB RAM, nVidia 6200 with 2 screens at 1200x1600

I tested MATE desktop with Firefox 51 (tried XRender on/off) and Chromium 55. I 
usually set the browser to fill half of the screen, that mean roughly the same 
number of pixels as a Full-HD (1920x1080) screen. I usually open 
https://www.heise.de and scroll up and down a bit.

nopack: almost the best of it all, responsiveness good, Chrome and Firefox 
without XRender laggy

rfb-hextile/tight: better for small screen updates, worse for large screen 
updates, scrolling in Firefox with XRender active is *very* smooth

rdp: almost identical to rfb

adaptive: middle ground, everything is laggy but at least there's always the 
same amount of lag for small and big screen updates. Unacceptable though 
because almost all text has JPEG artifacts no matter whether the quality is 
set to 1, 7 or 9. Graphics like Munin graphs are really ugly.

16m-png: good quality, mostly lag-free except Chrome and Firefox when XRender 
is off, becomes very unresponsive with lots of screen updates

16m-jpeg: artifacts, speed like adaptive


I believe nopack or rfb would give better performance if it was possible to 
circumvent going through SSH. I have set SSH to use arcfour (this is a 
trusted, isolated LAN) and performance has been slightly better.

Is there any way of making the initial authentication and startup through SSH 
but then having the NX connection going directly to the client? That would 
save a lot of processing power! (I'm thinking similar to the "tunnel" feature 
for sound.)

Regards,

Stefan
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